Bounds for maximal functions associated to rotational invariant measures in high dimensions

Details Bounds for maximal functions associated to rotational invariant measures in high dimensions Bounds for maximal functions associated to rotational invariant measures in high dimensions

2011-11-18

arxiv.org/abs/1111.4358v1

Mathematics

Classical Analysis and ODEs

Scientific paper

In recent articles it was proved that when $\mu$ is a finite, radial measure in $\real^n$ with a bounded, radially decreasing density, the $L^p(\mu)$ norm of the associated maximal operator $M_\mu$ grows to infinity with the dimension for a small range of values of $p$ near 1. We prove that when $\mu$ is Lebesgue measure restricted to the unit ball and $p<2$, the $L^p$ operator norms of the maximal operator are unbounded in dimension, even when the action is restricted to radially decreasing functions. In spite of this, this maximal operator admits dimension-free $L^p$ bounds for every $p>2$, when restricted to radially decreasing functions. On the other hand, when $\mu$ is the Gaussian measure, the $L^p$ operator norms of the maximal operator grow to infinity with the dimension for any finite $p> 1$, even in the subspace of radially decreasing functions.

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